This adjustable holder functions by connecting the two parts with an M2x12mm screw and a square M2 nut (might work with hex, not sure). I made this because my TrackIR camera is on top of my TV, so the usual parallel design really limited the available range of motion. With this, I easily get 45+ degrees through all axis, and can simply re-tilt as required.
I would recommend first clipping the headset piece on - it can slide up and down the band, but it's a very firm fit ‘horizontally’ so it doesn't shake about, so some level of force is required. Press one side of the headset band into the gap, then press while avoiding the connecting rod (it's fairly sturdy but try not to press against the rod regardless).
I printed mine from PLA, but it may be easier to press on if using ABS or another less stiff material.
Then press the square nut in (use a thin screwdriver or tool to really jam it in there), screw the parts together, voila, no more velcro required. Delanclip can then be slid in with some gentle pressure, and it holds really well.
At the moment, tightness of the angular adjustment is simply controlled by tightening the screw up a bit. Might improve this to include a locking screw in the future as it does run loose over time, but not become an annoyance yet.
The author marked this model as their own original creation.